9907316512921 has 3 divisors (see below), whose sum is σ = 9907319660511. Its totient is φ = 9907313365332.

The previous prime is 9907316512859. The next prime is 9907316512937. The reversal of 9907316512921 is 1292156137099.

The square root of 9907316512921 is 3147589.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4333845440521 + 5573471072400 = 2081789^2 + 2360820^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9907316512921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9907316512421) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1573795 + ... + 4721383.

It is an arithmetic number, because the mean of its divisors is an integer number (3302439886837).

Almost surely, 2^{9907316512921} is an apocalyptic number.

9907316512921 is the 3147589-th square number.

9907316512921 is the 1573795-th centered octagonal number.

It is an amenable number.

9907316512921 is a deficient number, since it is larger than the sum of its proper divisors (3147590).

9907316512921 is an frugal number, since it uses more digits than its factorization.

9907316512921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6295178 (or 3147589 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 55.

The spelling of 9907316512921 in words is "nine trillion, nine hundred seven billion, three hundred sixteen million, five hundred twelve thousand, nine hundred twenty-one".